DENTON (1080 KRLD) - Cities with red light cameras say they use them to improve safety. But in one North Texas city, a few police officers are allegedly getting rich off the cameras.

According to reports, Denton Assistant Police Chief Scott Fletcher racked up more than $120,000 in overtime pay, from 2014 to 2016, from the city's red light camera program.

A Lieutenant and a Sergeant also claimed tens of thousands of dollars in overtime pay from the program during that same period, an investigation by the Denton Record-Chronicle shows.

State law requires cities to keep red-light ticket fees in a fund which pays for capital improvement projects, including new street lights and pedestrian crosswalks.

In Denton, that traffic safety fund raked in an estimated $2.5 million during the 2016-17 fiscal year.

Denton Police Chief Lee Howell says the city acknowledges Assistant Chief Fletcher has received a disproportionate share of overtime from the traffic safety fund. And Howell admits he's concerned the amount of overtime creates the appearance of a conflict of interest.